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Genus (i.e. Fucus)
Species (i.e. Gardneri)
Common Name (i.e. Rock Weed)
Phylum (i.e. Ochrophyta)
All of the above
Sieve Kelp
Agarum clathratum
Authority:
Dumortier
North Pacific Distribution:
Arctic Ocean and Bering Sea, Alaska, to northern Washington; Korea; Japan; Russia.
Phylum:
Ochrophyta
Class:
Phaeophyceae
Order:
Laminariales
Family:
Costariaceae
Former Scientific Names:
Fucus agarum, Agarum cribrosum, A. gmelini, F. pertusus
Description: Thallus of this medium brown kelp has a branched holdfast (haptera), a stipe up to 30 cm (12 in) long, a stiff blade riddled with small, distinctive holes, and a wide midrib. The blade grows to 90 cm (35 in) long and 50 cm (20 in) wide. When present, fertile patches (sori) are found toward the edges of the blade. Habitat: This perennial kelp is found on rock in the very low intertidal to subtidal (to a depth of at least 15 m or 50’) and prefers a semi-protected habitat. Similar taxa:  Agarum fimbriatum, A. turneri, Thalassiophyllum.
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